What Is the Particle Model of Light

In optics the corpuscular theory of light arguably set forward by Descartes in 1637 states that light is made up of small discrete particles called corpuscles little particles which travel in a straight line with a finite velocity and possess impetusThis was based on an alternate description of atomism of the time period. For example it was known that when light reflects from a smooth surface the angle of incidence is equal to the angle of reflection.

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It also provided a basis for understanding why this model failed for more complex systems.

. The theory of wave-particle duality developed by Louis-Victor de Broglie eventually explained why the Bohr model was successful with atoms or ions that contained one electron. Particles are used in a range of products and manufacturing processes. In order to explore these critical and fascinating materials HORIBA designs manufactures and supplies state of the art particle characterization instruments.

This is also how an elastic frictionless ball bounces from a smooth surface. Isaac Newton was a pioneer of this theory. When a beam of light travels between two media having different refractive indices the beam undergoes refraction and changes direction when it passes from the first medium into the secondTo determine whether the light beam is composed of waves or particles a model for each can be devised to explain the phenomenon Figure 3.

N and k are the real and imaginary parts of the complex index of refraction respectively. The local light-enhancement factor ε n k r λ is the ratio of the local light intensity I p r to the incident light intensity I. Where r is the position in the particle.

The data from these instruments enables many of the manufacturing processes relied upon today and allows innovators to explore the future of both. H is Plancks constant. As we shall see a key property for the particle theory is refraction.

2 PARTICLE THEORY OF REFRACTION A light particle deep within a medium. Light acts as both a particle and a wave. ϕ is the quantum yield.

λ is the wavelength of the light. C is the speed of light.

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